如何在 plist 文件中保存 UISwitch 状态？

Question

我正在尝试保存 UISwitch 的状态。如果 UISwitch 状态为 "ON" 并且当用户退出应用程序并再次启动它时..应用程序应该显示以前的状态，如果用户计划将 UISwitch 的状态更改为 "OFF".. 他应该会收到一条消息，说明他之前有 "ON" 状态并更改为 状态“关闭”

如果你们能帮助我，那就太好了。谢谢

-(IBAction)notification:(id)sender
{
    if (sender == notifyMe)
    {
        if(notifyMe.isOn == YES)
        {
            toggle = YES;
            NSUserDefaults* defaults  = [NSUserDefaults standardUserDefaults];
            [defaults setBool:notifyMe.on forKey:@"switchValueKey"];
            [defaults synchronize];
            NSLog(@"Notification is ON");
        }
        else 
        {
            toggle = NO;
            NSLog(@"Notification is OFF");
        }
    }
    if ([cellDelegate respondsToSelector:@selector(notificationReqd:)])
    {
        [cellDelegate notificationReqd:self];
    }
}

Answer 1

更改您的按钮操作方法，例如：

-(IBAction)notification:(id)sender
{
    if (sender == notifyMe)
    {
         NSUserDefaults* defaults  = [NSUserDefaults standardUserDefaults];
         BOOL previousState = [defaults boolForKey:@"switchValueKey"];
        if(notifyMe.isOn == YES)
        {
            toggle = YES;

            NSLog(@"Notification is ON");
        }
        else 
        {
            toggle = NO;
            NSLog(@"Notification is OFF");
        }
        [defaults setBool:toggle forKey:@"switchValueKey"];
        [defaults synchronize];

         //You can show the message here
         NSLog(@"Previous state was %d",previousState);
    }
    if ([cellDelegate respondsToSelector:@selector(notificationReqd:)])
    {
        [cellDelegate notificationReqd:self];
    }
}

当你想获取存储的数据时可以使用：

 NSUserDefaults* defaults  = [NSUserDefaults standardUserDefaults];
 BOOL previousState = [defaults boolForKey:@"switchValueKey"];